Nitecore Custom 21700 5000mAh 3.6V Rechargeable Li-ion Battery NL2150HPi Features: Size: Custom 21700 Protected Capacity: 5000mAh Voltage: 3.6V Current Output: 15A Dimension: Length 75.2mm, Diameter 21.6mm Weight: 73g Note: Fits only for Nitecore i4000R, P10i, P20i, P30i, P20iX, P20i UV Flashlight. This is a custom battery. Package Includes: 1 x Nitecore Custom 21700 5000mAh 3.6V Rechargeable Li-ion Battery NL2150HPi Warranty : 1 year warranty from the date of purchase. Overdischarging or battery leakage is not covered nor is fast draining of battery while using. Please keep the voltage of all Li-Ion batteries above 3.8V for healthy storage. Recharge as soon as possible when you have run them down. Storing a depleted ( less than 3.2V open voltage ) battery may damage/ shorten life/cycle permanently.